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Q.

On addition of 1ml solution of 10% NaCl to 10ml gold sol in the presence of 0.0250gm of starch, the coagulation is just prevented Starch has the following gold number

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a

0.25

b

25

c

2.5

d

0.025

answer is D.

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Detailed Solution

The minimum milligrams of protective colloid required to prevent the coagulation of

10ml of gold sol by the addition to 1ml of 10% NaCl solution is called Gold number

           Gold number\; of\; protectivecolloid\propto\frac{1}{protective power}

10ml goldsol is prevented from coagulation by the addition of 0.025 grams of starch

\therefore Gold number= 0.025 X 103 =25

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On addition of 1ml solution of 10% NaCl to 10ml gold sol in the presence of 0.0250gm of starch, the coagulation is just prevented Starch has the following gold number